// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2010 Daniel Mack <daniel@caiaq.de>
 *
 * This software is distributed under the terms of the GNU General Public
 * License ("GPL") version 2, as published by the Free Software Foundation.
 *
 * This file holds USB constants and structures defined
 * by the USB Device Class Definition for Audio Devices in version 2.0.
 * Comments below reference relevant sections of the documents contained
 * in http://www.usb.org/developers/devclass_docs/Audio2.0_final.zip
 */

#ifndef __LINUX_USB_AUDIO_V2_H
#define __LINUX_USB_AUDIO_V2_H

#include <linux/types.h>

/* v1.0 and v2.0 of this standard have many things in common. For the rest
 * of the definitions, please refer to audio.h */

/*
 * bmControl field decoders
 *
 * From the USB Audio spec v2.0:
 *
 *   bmaControls() is a (ch+1)-element array of 4-byte bitmaps,
 *   each containing a set of bit pairs. If a Control is present,
 *   it must be Host readable. If a certain Control is not
 *   present then the bit pair must be set to 0b00.
 *   If a Control is present but read-only, the bit pair must be
 *   set to 0b01. If a Control is also Host programmable, the bit
 *   pair must be set to 0b11. The value 0b10 is not allowed.
 *
 */

static inline bool uac_v2v3_control_is_readable(u32 bmControls, u8 control)
{
    return (bmControls >> ((control - 1) * 0x2)) & 0x1;
}

static inline bool uac_v2v3_control_is_writeable(u32 bmControls, u8 control)
{
    return (bmControls >> ((control - 1) * 0x2)) & 0x2;
}

/* 4.7.2 Class-Specific AC Interface Descriptor */
struct uac2_ac_header_descriptor {
    __u8 bLength;            /* 9 */
    __u8 bDescriptorType;    /* USB_DT_CS_INTERFACE */
    __u8 bDescriptorSubtype; /* UAC_MS_HEADER */
    __le16 bcdADC;           /* 0x0200 */
    __u8 bCategory;
    __le16 wTotalLength; /* includes Unit and Terminal desc. */
    __u8 bmControls;
} __packed;

/* 2.3.1.6 Type I Format Type Descriptor (Frmts20 final.pdf) */
struct uac2_format_type_i_descriptor {
    __u8 bLength;            /* in bytes: 6 */
    __u8 bDescriptorType;    /* USB_DT_CS_INTERFACE */
    __u8 bDescriptorSubtype; /* FORMAT_TYPE */
    __u8 bFormatType;        /* FORMAT_TYPE_1 */
    __u8 bSubslotSize;       /* {1,2,3,4} */
    __u8 bBitResolution;
} __packed;

/* 4.7.2.1 Clock Source Descriptor */

struct uac_clock_source_descriptor {
    __u8 bLength;
    __u8 bDescriptorType;
    __u8 bDescriptorSubtype;
    __u8 bClockID;
    __u8 bmAttributes;
    __u8 bmControls;
    __u8 bAssocTerminal;
    __u8 iClockSource;
} __attribute__((packed));

/* bmAttribute fields */
#define UAC_CLOCK_SOURCE_TYPE_EXT 0x0
#define UAC_CLOCK_SOURCE_TYPE_INT_FIXED 0x1
#define UAC_CLOCK_SOURCE_TYPE_INT_VAR 0x2
#define UAC_CLOCK_SOURCE_TYPE_INT_PROG 0x3
#define UAC_CLOCK_SOURCE_SYNCED_TO_SOF (1 << 2)

/* 4.7.2.2 Clock Source Descriptor */

struct uac_clock_selector_descriptor {
    __u8 bLength;
    __u8 bDescriptorType;
    __u8 bDescriptorSubtype;
    __u8 bClockID;
    __u8 bNrInPins;
    __u8 baCSourceID[];
    /* bmControls and iClockSource omitted */
} __attribute__((packed));

/* 4.7.2.3 Clock Multiplier Descriptor */

struct uac_clock_multiplier_descriptor {
    __u8 bLength;
    __u8 bDescriptorType;
    __u8 bDescriptorSubtype;
    __u8 bClockID;
    __u8 bCSourceID;
    __u8 bmControls;
    __u8 iClockMultiplier;
} __attribute__((packed));

/* 4.7.2.4 Input terminal descriptor */

struct uac2_input_terminal_descriptor {
    __u8 bLength;
    __u8 bDescriptorType;
    __u8 bDescriptorSubtype;
    __u8 bTerminalID;
    __le16 wTerminalType;
    __u8 bAssocTerminal;
    __u8 bCSourceID;
    __u8 bNrChannels;
    __le32 bmChannelConfig;
    __u8 iChannelNames;
    __le16 bmControls;
    __u8 iTerminal;
} __attribute__((packed));

/* 4.7.2.5 Output terminal descriptor */

struct uac2_output_terminal_descriptor {
    __u8 bLength;
    __u8 bDescriptorType;
    __u8 bDescriptorSubtype;
    __u8 bTerminalID;
    __le16 wTerminalType;
    __u8 bAssocTerminal;
    __u8 bSourceID;
    __u8 bCSourceID;
    __le16 bmControls;
    __u8 iTerminal;
} __attribute__((packed));

/* 4.7.2.8 Feature Unit Descriptor */

struct uac2_feature_unit_descriptor {
    __u8 bLength;
    __u8 bDescriptorType;
    __u8 bDescriptorSubtype;
    __u8 bUnitID;
    __u8 bSourceID;
    /* bmaControls is actually u32,
     * but u8 is needed for the hybrid parser */
    __u8 bmaControls[]; /* variable length */
} __attribute__((packed));

/* 4.7.2.10 Effect Unit Descriptor */

struct uac2_effect_unit_descriptor {
    __u8 bLength;
    __u8 bDescriptorType;
    __u8 bDescriptorSubtype;
    __u8 bUnitID;
    __le16 wEffectType;
    __u8 bSourceID;
    __u8 bmaControls[]; /* variable length */
} __attribute__((packed));

/* 4.9.2 Class-Specific AS Interface Descriptor */

struct uac2_as_header_descriptor {
    __u8 bLength;
    __u8 bDescriptorType;
    __u8 bDescriptorSubtype;
    __u8 bTerminalLink;
    __u8 bmControls;
    __u8 bFormatType;
    __le32 bmFormats;
    __u8 bNrChannels;
    __le32 bmChannelConfig;
    __u8 iChannelNames;
} __attribute__((packed));

#define UAC2_FORMAT_TYPE_I_RAW_DATA (1 << 31)

/* 4.10.1.2 Class-Specific AS Isochronous Audio Data Endpoint Descriptor */

struct uac2_iso_endpoint_descriptor {
    __u8 bLength;            /* in bytes: 8 */
    __u8 bDescriptorType;    /* USB_DT_CS_ENDPOINT */
    __u8 bDescriptorSubtype; /* EP_GENERAL */
    __u8 bmAttributes;
    __u8 bmControls;
    __u8 bLockDelayUnits;
    __le16 wLockDelay;
} __attribute__((packed));

#define UAC2_CONTROL_PITCH (3 << 0)
#define UAC2_CONTROL_DATA_OVERRUN (3 << 2)
#define UAC2_CONTROL_DATA_UNDERRUN (3 << 4)

/* 5.2.5.4.2 Connector Control Parameter Block */
struct uac2_connectors_ctl_blk {
    __u8 bNrChannels;
    __le32 bmChannelConfig;
    __u8 iChannelNames;
} __attribute__((packed));

/* 6.1 Interrupt Data Message */

#define UAC2_INTERRUPT_DATA_MSG_VENDOR (1 << 0)
#define UAC2_INTERRUPT_DATA_MSG_EP (1 << 1)

struct uac2_interrupt_data_msg {
    __u8 bInfo;
    __u8 bAttribute;
    __le16 wValue;
    __le16 wIndex;
} __attribute__((packed));

/* A.7 Audio Function Category Codes */
#define UAC2_FUNCTION_SUBCLASS_UNDEFINED 0x00
#define UAC2_FUNCTION_DESKTOP_SPEAKER 0x01
#define UAC2_FUNCTION_HOME_THEATER 0x02
#define UAC2_FUNCTION_MICROPHONE 0x03
#define UAC2_FUNCTION_HEADSET 0x04
#define UAC2_FUNCTION_TELEPHONE 0x05
#define UAC2_FUNCTION_CONVERTER 0x06
#define UAC2_FUNCTION_SOUND_RECORDER 0x07
#define UAC2_FUNCTION_IO_BOX 0x08
#define UAC2_FUNCTION_MUSICAL_INSTRUMENT 0x09
#define UAC2_FUNCTION_PRO_AUDIO 0x0a
#define UAC2_FUNCTION_AUDIO_VIDEO 0x0b
#define UAC2_FUNCTION_CONTROL_PANEL 0x0c
#define UAC2_FUNCTION_OTHER 0xff

/* A.9 Audio Class-Specific AC Interface Descriptor Subtypes */
/* see audio.h for the rest, which is identical to v1 */
#define UAC2_EFFECT_UNIT 0x07
#define UAC2_PROCESSING_UNIT_V2 0x08
#define UAC2_EXTENSION_UNIT_V2 0x09
#define UAC2_CLOCK_SOURCE 0x0a
#define UAC2_CLOCK_SELECTOR 0x0b
#define UAC2_CLOCK_MULTIPLIER 0x0c
#define UAC2_SAMPLE_RATE_CONVERTER 0x0d

/* A.10 Audio Class-Specific AS Interface Descriptor Subtypes */
/* see audio.h for the rest, which is identical to v1 */
#define UAC2_ENCODER 0x03
#define UAC2_DECODER 0x04

/* A.11 Effect Unit Effect Types */
#define UAC2_EFFECT_UNDEFINED 0x00
#define UAC2_EFFECT_PARAM_EQ 0x01
#define UAC2_EFFECT_REVERB 0x02
#define UAC2_EFFECT_MOD_DELAY 0x03
#define UAC2_EFFECT_DYN_RANGE_COMP 0x04

/* A.12 Processing Unit Process Types */
#define UAC2_PROCESS_UNDEFINED 0x00
#define UAC2_PROCESS_UP_DOWNMIX 0x01
#define UAC2_PROCESS_DOLBY_PROLOCIC 0x02
#define UAC2_PROCESS_STEREO_EXTENDER 0x03

/* A.14 Audio Class-Specific Request Codes */
#define UAC2_CS_CUR 0x01
#define UAC2_CS_RANGE 0x02
#define UAC2_CS_MEM 0x03

/* A.15 Encoder Type Codes */
#define UAC2_ENCODER_UNDEFINED 0x00
#define UAC2_ENCODER_OTHER 0x01
#define UAC2_ENCODER_MPEG 0x02
#define UAC2_ENCODER_AC3 0x03
#define UAC2_ENCODER_WMA 0x04
#define UAC2_ENCODER_DTS 0x05

/* A.16 Decoder Type Codes */
#define UAC2_DECODER_UNDEFINED 0x00
#define UAC2_DECODER_OTHER 0x01
#define UAC2_DECODER_MPEG 0x02
#define UAC2_DECODER_AC3 0x03
#define UAC2_DECODER_WMA 0x04
#define UAC2_DECODER_DTS 0x05

/* A.17.1 Clock Source Control Selectors */
#define UAC2_CS_UNDEFINED 0x00
#define UAC2_CS_CONTROL_SAM_FREQ 0x01
#define UAC2_CS_CONTROL_CLOCK_VALID 0x02

/* A.17.2 Clock Selector Control Selectors */
#define UAC2_CX_UNDEFINED 0x00
#define UAC2_CX_CLOCK_SELECTOR 0x01

/* A.17.3 Clock Multiplier Control Selectors */
#define UAC2_CM_UNDEFINED 0x00
#define UAC2_CM_NUMERATOR 0x01
#define UAC2_CM_DENOMINTATOR 0x02

/* A.17.4 Terminal Control Selectors */
#define UAC2_TE_UNDEFINED 0x00
#define UAC2_TE_COPY_PROTECT 0x01
#define UAC2_TE_CONNECTOR 0x02
#define UAC2_TE_OVERLOAD 0x03
#define UAC2_TE_CLUSTER 0x04
#define UAC2_TE_UNDERFLOW 0x05
#define UAC2_TE_OVERFLOW 0x06
#define UAC2_TE_LATENCY 0x07

/* A.17.5 Mixer Control Selectors */
#define UAC2_MU_UNDEFINED 0x00
#define UAC2_MU_MIXER 0x01
#define UAC2_MU_CLUSTER 0x02
#define UAC2_MU_UNDERFLOW 0x03
#define UAC2_MU_OVERFLOW 0x04
#define UAC2_MU_LATENCY 0x05

/* A.17.6 Selector Control Selectors */
#define UAC2_SU_UNDEFINED 0x00
#define UAC2_SU_SELECTOR 0x01
#define UAC2_SU_LATENCY 0x02

/* A.17.7 Feature Unit Control Selectors */
/* see audio.h for the rest, which is identical to v1 */
#define UAC2_FU_INPUT_GAIN 0x0b
#define UAC2_FU_INPUT_GAIN_PAD 0x0c
#define UAC2_FU_PHASE_INVERTER 0x0d
#define UAC2_FU_UNDERFLOW 0x0e
#define UAC2_FU_OVERFLOW 0x0f
#define UAC2_FU_LATENCY 0x10

/* A.17.8.1 Parametric Equalizer Section Effect Unit Control Selectors */
#define UAC2_PE_UNDEFINED 0x00
#define UAC2_PE_ENABLE 0x01
#define UAC2_PE_CENTERFREQ 0x02
#define UAC2_PE_QFACTOR 0x03
#define UAC2_PE_GAIN 0x04
#define UAC2_PE_UNDERFLOW 0x05
#define UAC2_PE_OVERFLOW 0x06
#define UAC2_PE_LATENCY 0x07

/* A.17.8.2 Reverberation Effect Unit Control Selectors */
#define UAC2_RV_UNDEFINED 0x00
#define UAC2_RV_ENABLE 0x01
#define UAC2_RV_TYPE 0x02
#define UAC2_RV_LEVEL 0x03
#define UAC2_RV_TIME 0x04
#define UAC2_RV_FEEDBACK 0x05
#define UAC2_RV_PREDELAY 0x06
#define UAC2_RV_DENSITY 0x07
#define UAC2_RV_HIFREQ_ROLLOFF 0x08
#define UAC2_RV_UNDERFLOW 0x09
#define UAC2_RV_OVERFLOW 0x0a
#define UAC2_RV_LATENCY 0x0b

/* A.17.8.3 Modulation Delay Effect Control Selectors */
#define UAC2_MD_UNDEFINED 0x00
#define UAC2_MD_ENABLE 0x01
#define UAC2_MD_BALANCE 0x02
#define UAC2_MD_RATE 0x03
#define UAC2_MD_DEPTH 0x04
#define UAC2_MD_TIME 0x05
#define UAC2_MD_FEEDBACK 0x06
#define UAC2_MD_UNDERFLOW 0x07
#define UAC2_MD_OVERFLOW 0x08
#define UAC2_MD_LATENCY 0x09

/* A.17.8.4 Dynamic Range Compressor Effect Unit Control Selectors */
#define UAC2_DR_UNDEFINED 0x00
#define UAC2_DR_ENABLE 0x01
#define UAC2_DR_COMPRESSION_RATE 0x02
#define UAC2_DR_MAXAMPL 0x03
#define UAC2_DR_THRESHOLD 0x04
#define UAC2_DR_ATTACK_TIME 0x05
#define UAC2_DR_RELEASE_TIME 0x06
#define UAC2_DR_UNDEFLOW 0x07
#define UAC2_DR_OVERFLOW 0x08
#define UAC2_DR_LATENCY 0x09

/* A.17.9.1 Up/Down-mix Processing Unit Control Selectors */
#define UAC2_UD_UNDEFINED 0x00
#define UAC2_UD_ENABLE 0x01
#define UAC2_UD_MODE_SELECT 0x02
#define UAC2_UD_CLUSTER 0x03
#define UAC2_UD_UNDERFLOW 0x04
#define UAC2_UD_OVERFLOW 0x05
#define UAC2_UD_LATENCY 0x06

/* A.17.9.2 Dolby Prologic[tm] Processing Unit Control Selectors */
#define UAC2_DP_UNDEFINED 0x00
#define UAC2_DP_ENABLE 0x01
#define UAC2_DP_MODE_SELECT 0x02
#define UAC2_DP_CLUSTER 0x03
#define UAC2_DP_UNDERFFLOW 0x04
#define UAC2_DP_OVERFLOW 0x05
#define UAC2_DP_LATENCY 0x06

/* A.17.9.3 Stereo Expander Processing Unit Control Selectors */
#define UAC2_ST_EXT_UNDEFINED 0x00
#define UAC2_ST_EXT_ENABLE 0x01
#define UAC2_ST_EXT_WIDTH 0x02
#define UAC2_ST_EXT_UNDEFLOW 0x03
#define UAC2_ST_EXT_OVERFLOW 0x04
#define UAC2_ST_EXT_LATENCY 0x05

/* A.17.10 Extension Unit Control Selectors */
#define UAC2_XU_UNDEFINED 0x00
#define UAC2_XU_ENABLE 0x01
#define UAC2_XU_CLUSTER 0x02
#define UAC2_XU_UNDERFLOW 0x03
#define UAC2_XU_OVERFLOW 0x04
#define UAC2_XU_LATENCY 0x05

/* A.17.11 AudioStreaming Interface Control Selectors */
#define UAC2_AS_UNDEFINED 0x00
#define UAC2_AS_ACT_ALT_SETTING 0x01
#define UAC2_AS_VAL_ALT_SETTINGS 0x02
#define UAC2_AS_AUDIO_DATA_FORMAT 0x03

/* A.17.12 Encoder Control Selectors */
#define UAC2_EN_UNDEFINED 0x00
#define UAC2_EN_BIT_RATE 0x01
#define UAC2_EN_QUALITY 0x02
#define UAC2_EN_VBR 0x03
#define UAC2_EN_TYPE 0x04
#define UAC2_EN_UNDERFLOW 0x05
#define UAC2_EN_OVERFLOW 0x06
#define UAC2_EN_ENCODER_ERROR 0x07
#define UAC2_EN_PARAM1 0x08
#define UAC2_EN_PARAM2 0x09
#define UAC2_EN_PARAM3 0x0a
#define UAC2_EN_PARAM4 0x0b
#define UAC2_EN_PARAM5 0x0c
#define UAC2_EN_PARAM6 0x0d
#define UAC2_EN_PARAM7 0x0e
#define UAC2_EN_PARAM8 0x0f

/* A.17.13.1 MPEG Decoder Control Selectors */
#define UAC2_MPEG_UNDEFINED 0x00
#define UAC2_MPEG_DUAL_CHANNEL 0x01
#define UAC2_MPEG_SECOND_STEREO 0x02
#define UAC2_MPEG_MULTILINGUAL 0x03
#define UAC2_MPEG_DYN_RANGE 0x04
#define UAC2_MPEG_SCALING 0x05
#define UAC2_MPEG_HILO_SCALING 0x06
#define UAC2_MPEG_UNDERFLOW 0x07
#define UAC2_MPEG_OVERFLOW 0x08
#define UAC2_MPEG_DECODER_ERROR 0x09

/* A17.13.2 AC3 Decoder Control Selectors */
#define UAC2_AC3_UNDEFINED 0x00
#define UAC2_AC3_MODE 0x01
#define UAC2_AC3_DYN_RANGE 0x02
#define UAC2_AC3_SCALING 0x03
#define UAC2_AC3_HILO_SCALING 0x04
#define UAC2_AC3_UNDERFLOW 0x05
#define UAC2_AC3_OVERFLOW 0x06
#define UAC2_AC3_DECODER_ERROR 0x07

/* A17.13.3 WMA Decoder Control Selectors */
#define UAC2_WMA_UNDEFINED 0x00
#define UAC2_WMA_UNDERFLOW 0x01
#define UAC2_WMA_OVERFLOW 0x02
#define UAC2_WMA_DECODER_ERROR 0x03

/* A17.13.4 DTS Decoder Control Selectors */
#define UAC2_DTS_UNDEFINED 0x00
#define UAC2_DTS_UNDERFLOW 0x01
#define UAC2_DTS_OVERFLOW 0x02
#define UAC2_DTS_DECODER_ERROR 0x03

/* A17.14 Endpoint Control Selectors */
#define UAC2_EP_CS_UNDEFINED 0x00
#define UAC2_EP_CS_PITCH 0x01
#define UAC2_EP_CS_DATA_OVERRUN 0x02
#define UAC2_EP_CS_DATA_UNDERRUN 0x03

#endif /* __LINUX_USB_AUDIO_V2_H */
